Changeset 8728 for trunk/wp-includes/pluggable.php

Timestamp:

08/25/2008 05:52:28 PM (16 years ago)

Author:

ryan

Message:

wp_rand() - more randy rands

File:

• trunk/wp-includes/pluggable.php (modified) (1 diff)

trunk/wp-includes/pluggable.php

@@ -1352 +1352 @@
     $password = '';
     for ( $i = 0; $i < $length; $i++ )
-        $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
+        $password .= substr($chars, wp_rand(0, strlen($chars) - 1), 1);
     return $password;
+}
+endif;
+
+if ( !function_exists('wp_rand') ) :
+ /**
+ * Generates a random number
+ *
+ * @since 2.6.2
+ *
+ * @param int $min Lower limit for the generated number (optional, default is 0)
+ * @param int $max Upper limit for the generated number (optional, default is 4294967295)
+ * @return int A random number between min and max
+ */
+function wp_rand( $min = 0, $max = 0 ) {
+    global $rnd_value;
+
+    $seed = get_option('random_seed');
+
+    // Reset $rnd_value after 14 uses
+    // 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value
+    if ( strlen($rnd_value) < 8 ) {
+        $rnd_value = md5( uniqid(microtime() . mt_rand(), true ) . $seed );
+        $rnd_value .= sha1($rnd_value);
+        $rnd_value .= sha1($rnd_value . $seed);
+        $seed = md5($seed . $rnd_value);
+        update_option('random_seed', $seed);
+    }
+
+    // Take the first 8 digits for our value
+    $value = substr($rnd_value, 0, 8);
+
+    // Strip the first eight, leaving the remainder for the next call to wp_rand().
+    $rnd_value = substr($rnd_value, 8);
+
+    $value = abs(hexdec($value));
+
+    // Reduce the value to be within the min - max range
+    // 4294967295 = 0xffffffff = max random number
+    if ( $max != 0 )
+        $value = $min + (($max - $min + 1) * ($value / (4294967295 + 1)));
+
+    return abs(intval($value)); 
 }
 endif;